JPH08202424A - Numerical control data generating device - Google Patents

Abstract

PURPOSE: To reduce uncut part and to shorten the machining time with one tool by extracting internal corner position (recessed part) from an inputted external shape and correcting machining track data on the position. CONSTITUTION: A conventional recessed part machining division part is removed and a machining data correction part 5 which corrects external shape machining data itself to be correction data is provided instead. When the external shape is inputted to the external shape data input part 1, an internal corner extraction part 2 extracts a recessed shape part. Then, the tool (drill) which can machine the recessed part (e.g. slit shape part) of the external shape and is the thickest, namely, hard to break, is selected out of a tool shape storage part 4 and numerical control data is generated. Further, a machining data correction part 5 corrects the external shape machining data itself on the extracted recessed shape part to generate machining data. Thus, a machining process for correction is not added, but the data itself on external shape machining is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control data generating device, and more particularly to a numerical control data generating device for generating tool locus data for contour machining.

[0002]

2. Description of the Related Art Conventionally, as a numerical control data generating device of this type, for example, in Japanese Patent Laid-Open No. 3-179511, is it possible to cut from the shape of a recess and the shape of a tool when creating numerical data for external shape machining? There is disclosed a numerical control information creation apparatus configured to create a tool shape that can be machined and machining data when it is judged whether or not there is uncut material.

FIG. 6 shows a schematic configuration of this conventional numerical control data creating apparatus.

Referring to FIG. 6, when an outer shape is input to outer shape data input unit 1, a concave portion is extracted by inner corner extracting unit 2.

The uncut portion determining unit 7 extracts the recessed portion.
At, it is determined whether cutting is possible with a tool registered in the tool shape storage unit 4 in advance. If uncut material occurs, create a tool shape that can be cut and machining data, and add the machining process.

The recess processing division 8 determines a recess processing step from the extracted recess shape data, tool shape, and pre-machining shape data, and generates a processing step excluding the recess. The numerical control data creation unit 3 inputs numerically each processed shape and tool shape to create numerical control data, and the numerical control data output unit 6 outputs the numerical control data to a predetermined output device.

Next, the operation of the conventional numerical control data creating apparatus will be described by taking the concave external shape shown in FIG. 7 as an example.

When the external shapes P _{1 to} P ₆ shown in FIG. 7 are input,
It is extracted as a concave shape by the inner corner extraction unit 2. That is, a straight line parallel to the Z axis is extended from the point P _1, and the range P _{1 to} P ₅ surrounded by the intersection P ₅ with the processed shape is extracted by the inner corner extraction unit 2 as a concave shape.

Next, a forward cutting tool is selected as a candidate from the tools registered in the tool shape storage unit 4, and it is checked whether or not the concave portion can be cut in one process using only this forward cutting tool. I do.

When a forward-direction cutting tool that can be cut in one step is found, external-shape machining numerical control data for the forward-direction cutting tool selected by the numerical-control-data creating unit 3 is created.

If a cutting tool that can be cut in one step does not exist in the tool shape storage unit 4, a step that can be cut by the selected forward cutting tool T ₁ is first created. That is, the auxiliary cutting edge angle A _{1 of the} forward direction cutting tool T ₁ passes through the entry point P _{1 of the} recess.
A region P ₁ P _d P ₄ P ₅ surrounded by an intersection point P _d where a straight line having an inclination of intersects with the concave portion is determined as the machining process of the forward cutting tool T ₁ .

Next, in order to cut the region P ₁ P ₂ P ₃ P _d which must be cut by the reverse direction cutting tool, the tool shape memory unit 4
Further, the backward cutting tool T ₂ is selected, the numerical control data creation unit 3 creates external machining numerical control data of the backward cutting tool T ₂ , and a machining step is added.

As described above, in the conventional numerical control data creating apparatus, when there is a recess in the shape after machining, it is judged whether or not cutting can be performed without leaving uncut residue by a tool selected from pre-registered tools, and uncut residue is left. If any occurs, notify the operator of it with a message or graphic display, etc.
It is intended to provide numerical control data effective for actual cutting by generating a tool shape and a machining process that can be cut.

[0014]

However, in the above-mentioned conventional numerical control data generating device, since only the positive tolerance (+ a) is used as shown in FIG. 7, the correction for cutting the uncut portion is performed. There has been a problem that a processing step is required and the processing time is increased accordingly.

That is, the above-mentioned conventional numerical control data creating apparatus is intended to reduce the uncut portion of the outer shape processing shape by increasing the number of processing steps using a plurality of processing tools. As a result, the processing time is increased. There was a problem of doing.

Therefore, the present invention solves the above problems and reduces the uncut portion with one tool instead of correcting the uncut portion with another tool when creating the numerical control data for outer shape processing. The purpose is to make the numerical control data creation device that reduces the processing time steady by.

[0017]

In order to achieve the above object, the present invention has means for extracting an inner corner portion (recess) from an input external shape and means for correcting machining locus data of this portion. There is provided a numerical control data creation device characterized by:

[0018]

According to the present invention, the processing time is shortened by correcting the outer shape processing data itself, without adding a processing step for correction. At this time, by calculating the machining data of the inner corner (recess) considering not only the plus but also the minus tolerance, the outer shape (inner corner) can be machined with high accuracy even with one tool. it can.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the numerical control data creating apparatus of the present invention. 1, the same elements as those of FIG. 2 are designated by the same reference numerals. In the following, description of the same parts as those in the conventional example will be omitted.

In the numerical control data generating device of this embodiment,
The conventional concave portion processing division portion 8 is deleted, and instead, the processing data correction portion 5 that corrects the outer shape processing data itself to make correction data is provided.

When the outer shape is input to the outer shape data input unit 1, the inner corner extracting unit 2 extracts the concave shape portion. Next, from the tool shape storage unit 4, a tool (drill) that is the thickest, that is, hard to break, is selected from the tools capable of processing the concave portion (for example, slit shape portion) of the outer shape, and the numerical control data is created.

Further, the machining data correction unit 5 corrects the extracted outer shape machining data of the concave portion to obtain the machining data.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. 2 by taking the external shape having the inner corner (recess) shown in FIG. 3 as an example.

When the numerical control data creating apparatus of this embodiment inputs an external shape having a concave shape P ₁ P ₀ P ₂ as shown in FIG. 3 (step ST1), it stores tool information (tool information registered in advance). ), Select the optimum tool, and create numerical control data in the order of the machining process (step ST2).

Next, the inner corner (recess P ₁ P ₀ P ₂ ) is extracted from the input outer shape (steps ST3 and ST4), and the data of this portion is taken into consideration not only plus but also minus tolerance. The external machining numerical control data calculated as above is corrected (step ST5).

With reference to FIG. 3, a method of calculating a machining locus in this embodiment will be described.

When the outer shape P ₁ P ₀ P ₂ is input, in the above-mentioned conventional example, machining data in which the center of the tool moves to P _c P _a P _d was created, but in this embodiment, the center of the tool is Create machining data that moves with P _c P _b P _d .

That is, in the present embodiment, the conventional uncut portion width d _a is moved to P _c P _b P _d so as to be evenly distributed to the plus and minus tolerance ranges. The coordinates (x _b , y _b ) of this P _b are
The angle of 1/2 of the inner corner P ₁ P ₀ P ₂ is θ, the angle of the bisector of the inner corner is α, the coordinates of P ₀ are (x ₀ , y ₀ ), and the coordinates of P _a are (x _a , Y _a ) is calculated from the following equations (1) and (2). Also P _c ,
P _d is located at an arbitrary position (for example, φ / 2) from P _a .

[0030]

[Equation 1]

In this embodiment, by moving P _c P _b P _d in this manner, the uncut portion d _b becomes half of d _a .
In other words, the same effect can be obtained as when using a correction tool diameter of 1/2.

The uncut portion d _a in the conventional example and the uncut portion d _b (= d _a / 2) in this embodiment are 1 / the inner corner P ₁ P ₀ P ₂ .
The angle of 2 is θ, the coordinates of P ₀ are (x ₀ , y ₀ ), and the coordinates of P _a are (x _a , y _a ), and are calculated by the following equations (3) and (4).

[0033]

[Equation 2]

The machining locus P _c P _b P _d of the inner corner is
In this embodiment, a straight line is used to suppress an increase in the amount of data, but a curved line is also possible.

The inner corner angles of 90 ° and 60 ° will be described below as an example to explain specific numerical values.

FIG. 5 shows the above-mentioned conventional example when the inner corner angle is 90 °, but since only the plus tolerance (+ a) is used, the uncut portion d _a exceeds the tolerance range.

FIG. 4 shows machining trajectory data in this embodiment in which the uncut portion d _a is evenly distributed in the plus / minus tolerance range. That is, in the present embodiment, the center of the tool does not move to P ₁₅ P ₁₇ P ₁₈ , but from P ₁₇ to X.
Machining locus P passing P ₁₆ from the product by d _a / 2 in both direction Y
By moving ₁₅ P ₁₆ P ₁₈ , the uncut portion d _b becomes half of the uncut portion d _a of the conventional example.

Calculating a concrete machining path with the tool diameter φ at this time set to 2.00 mm, the uncut portion d is calculated from the above equation (3).
_a Although it is 0.292Mm, processing locus of this embodiment, by passing through P ₁₆ of 0.146mm product Towards P ₁₇ both XY directions,
The uncut portion d _b is 0.146 mm.

Next, when the inner corner angle is 60 °, the drilling diameter φ
Is 2.00 mm, the uncut portion d _a is 0.500 from the above formula (3).
It becomes mm. In the present embodiment, the uncut portion d _b is 0 by moving the machining path obtained from the above equations (1) and (2).
It will be 250 mm.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various embodiments according to the principles of the present invention are included.

[0041]

As described above, according to the numerical control data creating apparatus of the present invention, the contour machining data itself is compensated, so that the compensation machining step by another tool can be reduced. This is because the present invention can reduce the required tolerance by 50% when processed with the contour processing tool having the same diameter as compared with the conventional example. Therefore, the present invention has an effect that the outer shape can be processed with high accuracy and the processing time can be shortened without the correction processing step.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the embodiment of the present invention.

FIG. 3 is a diagram for explaining an example of an inner corner processing method according to an embodiment of the present invention.

FIG. 4 is a diagram for explaining an example (90 °) of an inner corner processing method according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example (90 °) of a processing method using only a plus tolerance.

FIG. 6 is a block diagram showing a schematic configuration of a conventional example.

FIG. 7 is a diagram for explaining a conventional method for determining the presence or absence of uncut portion.

[Explanation of symbols]

 1 External data input section 2 Inner corner extraction section 3 Numerical control data creation section 4 Tool shape storage section 5 Machining data correction section 6 Numerical control data output section 7 Uncut portion determination section 8 Recessed shape division section 9 Tool center locus 10 Tool A (Tool diameter φ) 11 Tolerance (± a)

[Procedure amendment]

[Submission date] April 21, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016] Accordingly, the present invention is to solve the above problems, when creating the outline processing numerical control data, rather than correcting the partial uncut portion at another tool, reducing the residual material in one single tool It is therefore an object of the present invention to provide a numerical control data creation device that shortens the processing time.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

[0018]

According to the present invention, the processing time is shortened by correcting the outer shape processing data itself, without adding a processing step for correction. Further, at this time, the processing data of the inner corner (recess), by calculating in consideration to minus tolerance amount of not only positive, be processed in one of the high precision contour (inner corner portion) in the tool You can

Claims (2)

[Claims] 1. A numerical control data generating apparatus comprising: a means for extracting an inner corner portion (recess) from an input external shape; and a means for correcting machining trajectory data of the inner corner portion. 2. The machining data of the inner corner portion is corrected to machining locus data which distributes the uncut width with respect to the center of the selected tool not only to the positive but also to the negative tolerance range. The numerical control data creating apparatus according to claim 1.